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Quality Parameters and Indices
Conformity based
-
External Volume Index EI
V
tissue,ref
is the normal tissue volume covered by D
ref
100 xc
c
c
x100
PTV
V
EI
1
2
1
ref
tissue,
− =
=
How much is the extension of D
ref
outside the target volume
PTV is the target volume
c
1
and c
2
are the two coefficients of COIN
Meertens H, Borger J et al.
Nucletron International
; 300–306 1994.